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Method and device for compressed-domain packet loss concealment

A technology for compressing domain and grouping data, applied in the field of error concealment, which can solve the problems of memory, calculation and energy consumption, etc.

Inactive Publication Date: 2006-02-08
NOKIA TECHNOLOGLES OY
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

The stated prior art solutions require more memory, computation and power consumption

Method used

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  • Method and device for compressed-domain packet loss concealment
  • Method and device for compressed-domain packet loss concealment
  • Method and device for compressed-domain packet loss concealment

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Embodiment Construction

[0048] After using various UEP (Unequal Error Protection) mechanisms, it may be the case at the receiver side that the most packet loss occurs in QMDCT (Quantized Modified Discrete Cosine Transform) data in AAC frames. Some packet loss occurs in the AAC scale factor. In rare cases, packet loss may occur in critical data, or in AAC headers and global-gain. If critical data is lost, it is difficult to decode the rest of the AAC frame.

[0049] Thus, the present invention performs error concealment directly in the compressed domain. In particular, the present invention conceals errors in three separate parts of an AAC frame: critical data including header and global_gain, QMDCT data, and scale factors. The error concealment method according to the present invention is shown in the flowchart 500 of FIG. 3 . After sorting the encoded audio bitstream by the bitstream demultiplexer (FIG. 2), the data 110 representation of the header and global gain in the AAC frame, the data 112 r...

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Abstract

An error concealment method and device for recovering lost data in the AAC bitstream in the compressed domain. The bitstream are partitioned into frames each having a plurality of data parts including the header / global gain, scale factors and QMDCT coefficients. The data parts are stored in a plurality of buffers, so that if one or more data parts of a current frame is corrupted or lost, the corresponding data part in the neighboring frames is used to conceal the errors in the current frame.

Description

[0001] Cross References to Related Applications [0002] This invention is related to co-pending US Patent Application Serial No. 10 / 281,395, filed October 23, 2002, assigned to the assignee of the present invention. This invention also relates to, and claims in part, co-pending Patent Application No. PCT / IB02 / 02193, filed June 14, 2002, assigned to the assignee of the present invention. technical field [0003] The present invention relates generally to error concealment, and more particularly to packet loss recovery for concealing transmission errors in digital audio streaming applications. Background technique [0004] If streaming media is available in mobile devices, users can use mobile devices for example to listen to music. For music listening applications, the audio signal is usually compressed into a digital packet format for transmission. The transmission of compressed digital audio such as MP3 (MPEG-1 / 2 layer 3) over the Internet has had a profound impact on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G10L19/02G10L19/14
CPCG10L19/005G10L19/0212G10L19/167H03M13/00
Inventor Y·王J·奥延佩拉J·科尔霍宁
Owner NOKIA TECHNOLOGLES OY
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